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A lot of people think the hole in the cap of a ballpoint pen is there to keep the pen from drying out, or that it’s there to keep a pressure balance that prevents the pen from leaking. The real reason it’s there is much more straightforward:

It’s there to lower the risk of suffocation. If a small child was chewing on the cap and choked on it, the hole keeps their airway from closing up entirely.

The first reason is to compensate for air pressure. When the plane climbs to cruising altitude, there’s a huge pressure difference between the inside and outside of the plane. The hole is there to regulate some of that difference so that the outer window doesn’t have to do all the work.

You probably always thought it was there for patches, right? Wrong! The manufacturer includes that little sample of material so you can test how different laundry detergents will react to your new garment.

This one is going to blow your mind. The hole’s primary purpose to strain the pasta and let the water drain out, but on many spoons, the hole is just about the size of one person’s portion of spaghetti.

Maybe you’ve never even noticed it before, but that little arrow is secretly the most convenient feature on any car. It indicates which side of the car the gas cap is on. Believe me, it comes in handy when you’re driving a rental car.

That little hole is there for a few reasons. The first is that it lets water drain out of the lock if you’re using it outdoors, so it won’t rust in the rain or freeze and break in the winter. The hole can also be used to oil the lock to keep it working well.

Those little cylinder-shaped lumps are ferrite cores or chokes, and they’re essentially just chunks of magnetic iron oxide that are there to suppress high-frequency electromagnetic interference.

Have you ever heard weird interference when your cell phone goes off too close to a speaker? Well, ferrite cores are there to keep that from happening to your monitors, power supplies, and everything else.

Most trained typists will already know what they’re there for. In 10-finger typing, the “F” and “J” keys are the home keys, where your index fingers rest. The little bumps let you find your way back to the home position without looking down at your keyboard.

The wings flip up to give you something to wrap the cable around. Start by wrapping the thicker section of cable around the power block, then the thinner part of the cable around the wings, and secure the whole thing with the little clamp on the very end.

And while we’re at it, what’s the dot next to the camera on an iPhone for?

Maybe you’ve noticed the little indentation on the lid of a package of Tic Tacs before and figured it was there to tightly seal the container, right? Well, it also serves as a dispenser that gives you one Tic Tac at a time.

You’ve always heard that it could erase pen ink. Well, it can. But it only really works on very strong, thick paper.

The blue side is harder and more abrasive that the softer pink side, and takes a lot more paper off when you use it, which is why you’ve probably erased clean through the paper any time you’ve tried to use it.

And why do wine and champagne bottles have those indentations in the bottom?

It’s not there so that the sommelier can get a better grip while they’re pouring, which is probably what you’ve always heard.

It’s actually there to compensate for the pressure that the contents of the bottle go through during the corking process. The sides and bottoms of bottles are weak spots, and the indentation helps evenly distribute the pressure inside the bottle. That’s why it’s so much deeper on champagne bottles, which are under much more pressure due to the carbonation.